[DISC-004] Prevent saving own profile

[chev0004]

Outline

Summary

Follow-up for DISC-004 that prevents users from saving their own profile and moves the saved-profile action into the card menu.

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Changes & Enhancements

• Type of Change:
  • Feature
  • Bugfix
  • Refactor
  • Chore
• Changes:
  • Discovery:
    • Prevent self-owned profiles from showing save affordances or saved state.
    • Move save and unsave actions into the profile card menu.
  • Saved profiles:
    • Reject attempts to save the signed-in user's own profile.
    • Filter self-owned profiles from saved profile IDs.
  • Stories and copy:
    • Update profile card saved-state stories for menu actions.
    • Update saved-empty-state copy.

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Page / App Changes

Affected Next.js Routes (Local):

• /en
• /ja
• /en/saved
• /ja/saved

Before (Screenshot)

After (Screenshot)

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Component / Storybook Changes

Affected Storybook Components (Local):

• Discovery/ProfileCard > SaveAction
• Discovery/ProfileCard > Saved

Before (Screenshot)

After (Screenshot)

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Not Doing

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Other (Remarks)

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Checklists

• Code is well-documented (comments, JSDoc, etc.).
• Existing comments were updated as needed.
• No out-of-scope changes are included.
• Write TODO comments where future work is required.
• Removed unnecessary debug code (e.g., console.log, debugger).
• Self-reviewed and tested locally.